[Bug 1682839] Re: package grub-efi-amd64-signed 1.80+2.02~beta3-4ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Tim Passingham]

I was upgrading from 16.10 to 17.04 and got this error.

I did a boot repair and all is now well. I believe the problem was that
the efi partition was not mounted.  I don't know why - I've not changed
anything since 16.10.

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Title:
  package grub-efi-amd64-signed 1.80+2.02~beta3-4ubuntu2 failed to
  install/upgrade: subprocess installed post-installation script
  returned error exit status 1

Status in grub2-signed package in Ubuntu:
  Confirmed

Bug description:
  I just boot the system using grub, once i logged in, the system
  prompted me with this error messages.

  ProblemType: Package
  DistroRelease: Ubuntu 17.04
  Package: grub-efi-amd64-signed 1.80+2.02~beta3-4ubuntu2
  ProcVersionSignature: Ubuntu 4.10.0-19.21-generic 4.10.8
  Uname: Linux 4.10.0-19-generic x86_64
  ApportVersion: 2.20.4-0ubuntu4
  AptOrdering:
   grub-efi-amd64-bin:amd64: Install
   grub-efi-amd64:amd64: Install
   grub-efi-amd64-signed:amd64: Install
   NULL: ConfigurePending
  Architecture: amd64
  Date: Fri Apr 14 19:11:38 2017
  ErrorMessage: subprocess installed post-installation script returned error exit status 1
  RelatedPackageVersions:
   dpkg 1.18.10ubuntu2
   apt  1.4
  SourcePackage: grub2-signed
  Title: package grub-efi-amd64-signed 1.80+2.02~beta3-4ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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